High severity7.5NVD Advisory· Published Sep 9, 2026· Updated Sep 15, 2026
CVE-2026-87011
CVE-2026-87011
Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, the unauthenticated POST /oauth/backchannel-logout handler in backend/open_webui/utils/oauth.py fetched the OIDC discovery document and signing keys before validating a submitted logout token. Each request repeated uncached network fetches, and the signing-key lookup blocked the async event loop, so requests carrying invalid tokens could stall the single-worker instance and amplify traffic to the identity provider when ENABLE_OAUTH_BACKCHANNEL_LOGOUT was enabled. This issue is fixed in version 0.11.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuiPyPI | >= 0.9.0, < 0.11.1 | 0.11.1 |
Affected products
3(expand)+ 2 more
- (no CPE)
- cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*range: >=0.9.0,<0.11.1
- (no CPE)range: 0.9.0 - 0.11.0
Patches
Vulnerability mechanics
References
5- github.com/open-webui/open-webui/commit/aeda6ff13a25d3b3ba1b303609f35382db22142cnvdPatchWEB
- github.com/open-webui/open-webui/security/advisories/GHSA-3g9q-v48f-hh9wnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-3g9q-v48f-hh9wghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-87011ghsaADVISORY
- github.com/open-webui/open-webui/releases/tag/v0.11.1nvdRelease NotesWEB
News mentions
1- Open WebUI: 18 Vulnerabilities Disclosed, Patch Released in Version 0.11.1Vypr Intelligence · Sep 10, 2026